Weekend trip with new baby

C

My baby girl isn't here yet. She's due Monday if I make it that long. Here's my dilemma. My brother is getting married at the end of this month and their wedding is a whole weekend thing due to the distance we'd be traveling. It's not a normal weekend away though, we are basically going to be camping. So here's my question. I know I can breastfeed while there obviously but since I'm in the wedding I'd like to pump prior to have some for my husband and parents to be able to feed her as well. How much is a good amount to pump for a weekend and how long can it last? What's the best storage option for carrying it with us? Any ideas would be helpful.